pc cards
In computing , PC Card (originally PCMCIA) is the form factor of a peripheral interface designed for laptop computers. It was originally for memory expansion, but the existence of a usable general standard for notebook peripherals led to many kinds of devices being made available in this form. Typical devices include network cards , modems , and hard disks . The original use, for memory-expansion cards, is no longer common. Many notebooks in the 1990s came with two type-II slots with no barrier in between (allowing installation of two type-II cards or one type-III card). With the removal of legacy ports, most contemporary notebooks only feature a single type-II card slot[ citation needed ]. The United States computer industry created the Personal Computer Memory Card International Association to challenge the Japanese JEIDA memory card devices by offering a competing standard for memory-expansion cards. The two standards later merged as JEIDA 4.1 or PCMCIA 2.0 (PC Card) in 1991 . T...